Charles a



c. A. BLAKE.

Burglar Alarm. 9 "No. 59,949. 9 Patented Nov. 27,1866, 9

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IMPROVED BURGLAR ALARM.

SPZEGIFIOAJIION.

TO ALL WHOM IT MAY CONCERN:

Be it known that I, CnARLns A. BLAKE, of Philadelphia, in the county ofPhiladelphia, and State of Pennsylvania, have invented a new andimproved Burglar Alarm; and I do hereby declare the following to be afull, clear, and exact description thereof, which will enable thoseskilled in the art to make and use the same, reference being had totheaccompanyingdrawings forming part of this specification.

The present invention relates to a novel and extremely simple burglaralarm, which in operation and use is quite eiiicient and certain, aswill be apparent from.the following detail description of the same,reference being had to the accompanying plate of drawings, in whichFigure 1 is a transverse horizontal section through a door and itsfiame, showing my improved burglar alarm applied to it.

Figure 2, a plan or top view of the burglar alarm detached; and Figures3 and 4, detail views to be hereinafter referred to. p l A, in thedrawings. represents a block or plate of metal or other suitablematerial, which constitutes the holder for my improved burglar alarm,and is at each end provided with holes, B, to receive screws ,forfasteningv it in position, either to a door or window frame, as may bedesired. On this block, A, parallel uprights, G, are

secured, between which extends a hollow tube or barrel, D, having at itsclosed end a friction primer, E, that by means of its looped and, F, ishung to and upon the pin or stud, G, of a forked lever or arm, H, hungby the ends of its forked arms to and upon lugs, I, of the block A, soas to swing or turn. This lever arm, H, at one end, J, is flattened, andwhen the block having my improved alarm arranged upon it, as aboveexplained, is secured to the door frame, projects beyond the edge of thedoor frame into proper position for being acted upon by the door, as itis swung open, and thus through it moving the friction primer in such amanner as to cause it to explode the primer, and consequently producesufiicient noise to awaken and alarm the occupants of the room or houseto which such doorway constitutes the entrance, as is obvious withoutany further explanation. When my improved burglar alarm is to be usedupon windows, the lever, L, shown detached in figs. 3 and 4, is

employed, this lever being hung by its centre or fulcrum pin, N, in thesocket, O, of the alarm block, A, and by its end pin, P, then hung tothe primer loop, F.

- I claim as new and desire to secure by Letters Patent V [he block A,primer E, and forked lever H, or lever L, when combined and arrangedtogether substantially as and for the purpose described.

CHAS. A. BLAKE.

Witnesses 1 WM. H. BUTLER, Anson R. LUKnns.

